DNA synthesis in cells of human tuberculous lymph nodes

DNA metabolism of cells of tuberculous lymph nodes was studied autoradiographically with 3H-thymidine injected directly into one of the afferent lymph vessels. The undifferentiated mononuclear cells showed the most intensive DNA synthesis, but a large number of epitheloid cells had also become labelled. The nuclei of the giant Langhans cells took no label.